Pregnant?

Boyfriend and I had unprotected sex, normally we use condoms but a few in the pack we had broke. We finished without a condom but he didn't cum in me. He didn't pull out RIGHT before either. I'll finish him then he does the "happy dance". I did take plan b on the 19th, my period was suppose to start today. But it's late. I took plan b as a precautionary thing, we rarely need it because we always use condoms. I'm just worried there's a chance of conception because my period is a little late. I know plan b messes up your cycle and hormones. We did this (basically exact same thing) a couple night in a row. Again, did NOT cum in me. Thoughts?